Stainless Steel Pipes & Tubes Supplier in India
Stainless Steel Pipes Supplier, Stockist & Exporter in India
Aashish Metal & Alloys is a major stainless steel pipes and tubes supplier and stockist in Mumbai, India and supply them to industries throughout the country and around the globe. Having supplied specialty stainless steel products since [2002], Aashish Metal & Alloys maintains one of the largest ready-stock inventories in Mumbai, our one of the largest ready stock inventories of stainless steel pipes and tubes, including austenitic, ferritic, duplex, and super duplex grades ensure that your project has no avoidable delays.
Our stainless steel pipes and tubes are ASTM A312, ASTM A213, ASTM A269, ASME SA213, ASTM A358, ASTM A789 and ASTM A790 compliant. All items ship complete with full mill test certificates, chemical composition reports and mechanical property data for traceability and confidence, giving engineers and procurement managers the data they need. Whether you need stainless instrument tubing from 1/8″ NB or large-bore pipes up to 30″ NB, Aashish Metal & Alloys has you covered with all your stainless piping needs, from schedule 5S thin-wall to XXS heavy-wall.
Stainless Steel Grades Available for Pipes and Tubes
The difference is mainly in how the product is ordered. Pipe is specified by Nominal Pipe Size (NPS) and schedule—for example, 2 in NPS Schedule 40S—and its actual outside diameter is set by the pipe dimensional standard. Tube is specified by exact outside diameter × wall thickness—for example, 12.7 mm OD × 1.24 mm wall—because tube fittings, tube sheets and instrumentation systems depend on a precise OD. Both pipe and tube can be seamless or welded when the applicable material standard permits it. Selection should follow the product standard, design code, pressure/temperature duty and dimensional tolerance required by the application.
Available Product Forms of Stainless Steel Pipes and Tubes
Stainless Steel Seamless Pipes
Stainless Steel Welded Pipe
Stainless Steel Seamless Tubing
Technical data
Stainless Steel Pipes & Tubes Product Overview
| Product form | What we supply | Typical standard |
|---|---|---|
| Seamless Pipes | Hot-rolled and cold-drawn, no weld seam, for high-pressure and critical service | ASTM A312 |
| Welded Pipes (ERW/EFW) | Strip or plate formed and longitudinally welded, cost-efficient at larger diameters | ASTM A312, A358 |
| Seamless & Welded Tubes | Precision OD/wall-thickness product for instrumentation, heat exchange and structural use | ASTM A213 (seamless heat-exchanger/boiler tube), ASTM A249 (welded heat-exchanger/boiler tube), ASTM A269 (seamless/welded general-service tube) |
| Sanitary Tubing | Polished tubing for food, dairy and pharmaceutical CIP/SIP lines | ASTM A270 |
| Duplex / Super Duplex Pipe & Tube | 2205 and 2507 for offshore, desalination and chloride-heavy service | ASTM A789, A790 |
| High-Alloy 904L Pipe & Tube | For sulphuric and phosphoric acid environments | ASTM B677 / ASME SB677 |
| Square, Rectangular & Oval Sections | Structural and architectural profiles | ASTM A554 for welded mechanical tubing / project specification |
Stainless Steel Pipes Specifications: Sizing & Standards
| Parameter | Details |
|---|---|
| Applicable standards | ASTM A312 / ASME SA312; ASTM A213 / ASME SA213; ASTM A269; ASTM A249; ASTM A358 / ASME SA358; ASTM A789 / ASME SA789; ASTM A790 / ASME SA790; ASTM A270; ASTM B677 / ASME SB677; ASME B36.19M dimensions |
| Pipe size range | 1/8" NB to 30" NB, subject to grade and manufacturing-form availability |
| Tube OD range | 5.8 mm to 508 mm, subject to grade and product-form availability |
| Wall thickness | 0.30 mm to 50 mm; Schedule 5S through XXS where applicable to the selected pipe size/grade |
| Manufacturing types | Seamless (hot-rolled/cold-drawn), ERW, EFW, LSAW |
| End finish | Plain End, Bevelled End, Threaded End |
| Surface finish | Annealed & pickled, bright annealed, polished and electropolished; No.4/No.8 finishes for decorative or mechanical tubing where applicable |
| Length | Single Random, Double Random, Fixed/Cut-to-Length |
ASTM A312 Chemical Composition – Selected Elements (Common Grades)
| Grade | UNS | C max (%) | Cr (%) | Ni (%) | Mo (%) |
|---|---|---|---|---|---|
| TP304 | S30400 | 0.08 | 18.0 – 20.0 | 8.0 – 11.0 | – |
| TP304L | S30403 | 0.035 | 18.0 – 20.0 | 8.0 – 12.0 | – |
| TP316 | S31600 | 0.08 | 16.0 – 18.0 | 11.0 – 14.0 | 2.00 – 3.00 |
| TP316L | S31603 | 0.035 | 16.0 – 18.0 | 10.0 – 14.0 | 2.00 – 3.00 |
| TP321 | S32100 | 0.08 | 17.0 – 19.0 | 9.0 – 12.0 | – |
| TP347 | S34700 / S34709 | 0.08 | 17.0 – 19.0 | 9.0 – 13.0 | – |
This is a selected-element reference. ASTM A312 also controls Mn, P, S, Si and grade-specific stabilising elements/footnotes. Final acceptance must be against the current material specification and the Mill Test Certificate for the supplied heat.
Stainless Steel Pipes Mechanical Properties (ASTM A312)
| Grade | Tensile strength (min) | Yield strength (min) | Elongation (min) |
|---|---|---|---|
| TP304 / TP316 | 515 MPa | 205 MPa | 35% |
| TP304L / TP316L | 485 MPa | 170 MPa | 35% |
| TP321 / TP347 | 515 MPa | 205 MPa | 35% |
Minimum room-temperature values shown for common ASTM A312 grades. The governing product specification, product form and Mill Test Certificate take precedence.
Stainless Steel Pipe Grades: Properties & Applications
| Grade | UNS | Key property | Common application |
|---|---|---|---|
| 304 / 304L | S30400 / S30403 | General corrosion resistance | Food processing, architecture, water treatment |
| 309 / 309S | S30900 / S30908 | High-temperature oxidation resistance | Furnace parts, radiant tubes, kiln liners |
| 310 / 310S | S31000 / S31008 | Higher high-temperature oxidation resistance | Annealing boxes, muffles, cement kilns |
| 316 / 316L | S31600 / S31603 | Chloride & pitting resistance | Marine, pharma, chemical, coastal structures |
| 316Ti | S31635 | Stabilised, resists sensitisation | Welded assemblies, chemical plant |
| 317L | S31703 | Higher Mo, better pitting resistance | Pulp & paper, sulphuric acid environments |
| 321 | S32100 | Ti-stabilised, weld decay resistant | Aircraft exhausts, jet engine parts |
| 347 / 347H | S34700 / S34709 | Nb-stabilised, high-temp service | Petroleum refining, elevated-temp piping |
| Duplex 2205 | S32205 | High strength + corrosion resistance | Offshore, desalination, heat exchangers |
| Super Duplex 2507 | S32750 | Extreme corrosion resistance | Subsea, FGD, seawater systems |
| 904L | N08904 | High-alloy acid & chloride resistance | H2SO4 plants, phosphoric acid, bleach |
Seamless vs. Welded Stainless Steel Pipe: How to Choose
| Parameter | Seamless SS pipe | Welded SS pipe (ERW/EFW) |
|---|---|---|
| Manufacturing | Hot-rolled or cold-drawn billet, no weld seam | Strip/plate formed and longitudinally welded |
| Pressure rating | No longitudinal weld seam; often selected where seamless construction is specified for critical service. Design pressure still depends on grade, wall, temperature and design code. | Suitable for pressure service when produced and inspected to the applicable material standard/design code. Capacity depends on grade, wall, temperature, weld category and examination. |
| Size range | Available range depends on grade and mill route; generally a smaller maximum OD than large-bore welded/EFW product. | Aashish supply range to 30" NB; larger EFW/LSAW sizes only on confirmed enquiry. |
| Cost | Typically higher because of the seamless manufacturing route and size/grade availability | Often more economical at larger diameters, subject to grade, wall and examination requirements |
| Best suited for | Process and critical services where seamless construction is specified | Process, sanitary, structural and large-bore service where welded construction is permitted |
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Stainless Steel Pipes Applications by Industry
| Industry | Typical grades | Application |
|---|---|---|
| Oil & Gas / Refining | 316L, 321, 347, Duplex 2205 | Process lines, heat exchangers and offshore headers; sour-service projects subject to NACE MR0175 / ISO 15156 project requirements |
| Chemical & Petrochemical | 304L, 316L, 317L, 904L | Reactors, storage tanks, condensers, corrosive-media piping |
| Power Generation | 304H, 316H, 321H, 347H | Boiler superheater tubes, steam lines, heat recovery systems |
| Pharmaceutical & Biotech | 316L (Sanitary) | CIP/SIP lines, sterile transfer, pure water distribution |
| Food & Beverage | 304 / 316L (A270) | Milk lines, brewery piping, beverage transfer |
| Desalination & Water Treatment | Super Duplex 2507, 316L | Brine lines, RO pressure vessels, evaporators |
| Marine & Offshore | 316L, Duplex 2205/2507 | Deck piping, firewater mains, ballast systems |
| Construction & Architecture | 304 / 316 | Structural handrails, facade cladding, roofing |
Quality Control & Testing
| Test / inspection | Purpose |
|---|---|
| Hydrostatic Test | Pressure-integrity test where required by the applicable product standard or purchase order |
| Ultrasonic Testing (UT) | Detect internal flaws, laminations and inclusions |
| Eddy Current Testing (ECT) | Surface and near-surface discontinuity detection in tubes |
| Radiographic Testing (RT) | Weld integrity verification for EFW and fabricated pipe |
| Positive Material Identification (PMI) | Confirm alloy grade / heat chemistry when specified |
| Intergranular Corrosion Test (IGC) | Assess sensitisation/intergranular-corrosion resistance when specified for the grade/service (ASTM A262) |
| Dimensional Inspection | OD, wall thickness, length, straightness and ovality |
| Hardness Testing | Verify heat-treatment condition and material grade |
Orders can be supplied with EN 10204 3.1 Mill Test Certificates, chemical/mechanical test results and heat-number traceability. EN 10204 3.2 and third-party inspection by agencies such as BV, SGS or TÜV can be arranged when specified in the purchase order.
Stainless Steel Pipe Sizes, Schedules & Weight Reference
Pipe dimensions should be read against ASME B36.19M for wrought stainless steel pipe. NPS is nominal; the outside diameter is fixed for each NPS while wall thickness changes with schedule. Sample 40S/80S values are below; confirm the full size/schedule range against the applicable dimensional standard and the order specification.
| NPS | OD (mm) | 40S WT (mm) | 80S WT (mm) | 40S kg/m | 80S kg/m |
|---|---|---|---|---|---|
| 1/2" | 21.34 | 2.77 | 3.73 | 1.28 | 1.64 |
| 3/4" | 26.67 | 2.87 | 3.91 | 1.70 | 2.22 |
| 1" | 33.40 | 3.38 | 4.55 | 2.53 | 3.27 |
| 1-1/2" | 48.26 | 3.68 | 5.08 | 4.09 | 5.46 |
| 2" | 60.33 | 3.91 | 5.54 | 5.50 | 7.56 |
| 3" | 88.90 | 5.49 | 7.62 | 11.41 | 15.43 |
| 4" | 114.30 | 6.02 | 8.56 | 16.24 | 22.55 |
| 6" | 168.28 | 7.11 | 10.97 | 28.54 | 42.99 |
| 8" | 219.08 | 8.18 | 12.70 | 42.97 | 65.29 |
| 10" | 273.05 | 9.27 | 12.70 | 60.91 | 82.36 |
| 12" | 323.85 | 9.53 | 12.70 | 74.62 | 98.43 |
Approx. mass (kg/m) = (OD − WT) × WT × 0.02491 for austenitic stainless steel at ~7.93 g/cm³. Use mill/theoretical data for final commercial weight.
Stainless Steel Pipes Price per Kg
Stainless steel pipe pricing is quoted per kilogram and moves with several variables rather than a flat rate card:
- Grade and nickel/molybdenum content — 316/316L runs above 304/304L; duplex and 904L sit higher still
- Manufacturing type — seamless pipe carries more processing cost than ERW or EFW welded pipe at the same size
- Surface finish — mirror-polished and electropolished finishes cost more than mill (2B) finish
- Wall thickness and schedule — heavier-wall XXS product uses more material per metre than thin-wall 5S
- Order quantity — volume orders typically qualify for tiered discounts over small cut-length orders
- Nickel/molybdenum alloy surcharge and market price — major cost inputs for austenitic and high-alloy grades; quotations are typically time-limited
How Stainless Steel Pipes & Tubes Are Manufactured
- Seamless hot-finished pipe
The products Aashish Metal & Alloys supplies are produced at approved mills using the process specified for the order. For seamless hot-finished pipe, a solid billet is heated and pierced into a hollow shell, then hot-finished to the required dimensions. After heat treatment, the product is straightened, descaled or pickled as applicable, inspected and tested to the governing material standard. - Seamless cold-finished pipe and tube
A hot-finished hollow is cold-drawn or pilgered over a mandrel to achieve tighter OD/wall tolerances and a smoother surface. Intermediate and final heat treatment and pickling are applied as required by the product standard. - Welded pipe and tube
Stainless strip or plate is formed and longitudinally welded, then heat-treated, finished and examined to the applicable pipe or tube standard. ASTM A790 welded duplex pipe is made by an automatic welding process without filler metal; other welded product standards have their own manufacturing and examination requirements.
Frequently Asked Questions – Stainless Steel Pipes and Tubes
The common difference between stainless steel pipes and tubes is that Pipes are measured by inside diameter (ID) and used for fluid flow, while tubes are measured by outside diameter (OD) and used for structural or precise applications.
The A4 / 316 stainless steel offers the best corrosion resistance, especially in marine and chemical environments.
Yes, both seamless and welded stainless steel pipes are available.
The common standards include ASTM A213, A269, A249, and EN 10296-2.
Yes, stainless steel pipes can be supplied in custom lengths as per project requirements.
Yes, Material Test Certificates (MTC) and third-party inspection can be provided on request.
Need Stainless Steel Pipes or Tubes to Spec?
Send the grade, standard, size or OD, schedule/wall thickness, quantity, finish and certification requirement. Our team will confirm availability, documentation and lead time with the quotation.
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